Steam-turbine.



S. MARQUIS. STEAM TURBINE. APPLICATION FILED FEB- 9, I9l4- RENEWED DEC. 3, 1915 i 1 yms. Patented June13, 1916.

the tenons.

fiYDNEY MARQUIS, 0F MILWAUKEE, WISCONSIN, A$SIGNR T0 ALLIS-CHALMERS MANUFACTURING COMPANY, OF MILWAUKEE, WSCONSEN, A CGEPOBATIQN OF nnnawann,

inane-as. Speciflcati STEAM-TURBINE.

a Lette s' Patented June is, rare;

Application filed February 9, 1914, Serial No. Win54. Renewed December 3, 1915. Serial No. 65,398.

To all whom it may concern Be it known that l, SYDNEY MARQUIS, a

citizen of the United States, residing at ."West Allis, Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented acertain new and useful Improvement in Steam-Turbines, of which the fol-' lowing is a specification.

This invention relates to steam turbines and more particularly to a method of securing the shroud to the blade ends and for properly positioning the blades at one end. An object of the invention is to provide an assembled blade structure for steam turbines which is simple in construction,

efficient in operation, and which possesses the requisite amount of rigidity and strength, especially to withstand vibratlon.

One of the more specific objects of the invention is to provide en icient means for securing a comparatively light shroud to the ends of a plurality of blades by fusion of metal, this shroud being imperforate and being provided with means in the form of a recessed projection, for properly positioning the blade ends.

Another object is to provide a shroud having side projections which coact with edge portions of the blades in order to properly aline the blade ends in a direction transversely of the row of blades.

Heretofore it had been proposed to fasten a shroud to the ends of blades by fusion of metal, for instance by brazing, the blade ends having been properly positioned by forming a tenon on the blade and inserting the same in a hole formed in the shroud.

The objections to this construction are, first, that considerable of the blade stock is wasted in forming the tenon; and second, that the shroud is weakened at least temporarily, by forming the holes therein for With the use of the present invention these objections are eliminated;

A clear conception of an embodiment of the invention may be had by referring to the drawing accompanying and forming a part of this specification in which like ref erence characters designate the same or similar parts in the various views.

Figure 1 is an elevation of a fragment of a shroud attached to a plurality of blade fragments. Fig. 2 is a transverse section along the line H-H of Fig. 1 looking in the direction of the arrows. Fig.- 3 is a transverse vertical section through a shroud attached to a fragment of a blade and showinga fragment of the stationary casing, the section being taken along the line HIIII of Fig. 2. Fig. 4 is a transverse vertical sectionthrough a shroud attached to a fragment of a blade and showinga fragment of the stationary casing, the section being taken along the line IV IV of Fig. 2.

While the figuresot the drawingdisclose rotor or movable blading of a turbine of the parallel flow type, it is to be understood that the invention is equally applicable to stator or stationary blading as well as to other types of turbines. The shroud. 2, which is preferably made as light as possible, is provided on its blade side with a pair of side projections i and an intermediate projection 7, these projections prior to being notched for insertion of the blade ends being continuous throughout the length of the shroud stock. The intermediate projection 7 is considerably larger than the side projections d.

In order to permit proper positioning of the blade ends, the projections at, 7, of the Y been previously fixed in a suitable foundation segment in the usual manner. In order to permit insertion of the ends of the blades- 1 within the recesses 8 formed inthe projection 7, the edge portions of the blade ends are slightly notched, see Fig. 4:, these notched portions of the blades coacting with the side projections 1. After the shroud 2 has been applied to the ends of the blades 1, the blades and shroud are united by fusion of metal by any suitable process, such as soldering, brazing, or Welding.

The outer surface of the shroud 2 with the structure complete is finished in the form of a cylindrical surface, which with the turbine assembled, Operates in'close proximity to the stationary turbine casing 3.

It will be noted that the recesses 8 formed in the side projections 4c are not utilized in positioning the blades 1, the production of these recesses merely facilitating the oper ation of recessing the intermediate pro ection 7. The portions of the side projections 4: which remain after the recesses 8 have been cut, serve to properly aline the blade ends in a direction transversely to the row of blades'l. The recesses 8 formed in the intermediate projection with the 'Working faces of the blades longitudinally to amaximum extent.

It will b noted that by. the use of the form of shroud 2 as disclosed, the blade ends canbe united by fusion of metal directly to the surface of the shroud 2 adjacent these ends Without necessitating Waste of blade stock such as results from forming spacing and angling tenons on the blades 1. The

7 serve to properly space and angle the blade ends, the angling fact combination of an imperforateshroud having a recessed projection with a plurality of blades united thereto by fusion of metal results in a structure having great rigidity and strength.

It should be understood that it is notv desired to be limited to the exact details of construction shown and described except as required by the scope of the appended claims, for obvious modifications Will occur to a person skilled in the art.

It is claimed and desired to secure by Letters Patent,- 1. The process of providing a blade with a shroud comprising, producing a shroud with a continuous projection, forming a recess in said projection, applying said shroud to the end of said blade at said recess, and unitingsaid blade and said shroud by fusion of metal. t

2. Thejprocess of providing a blade with a shroud comprising, producing a shroud with a continuous longitudinal projection, removing'a portion of said projection, applying said shroud to the end of said blade at said removed portion, and uniting said blade and said shroud by fusion of metal.

in testimony whereof, the signature of the inventor is afiixed hereto in the presence of two witnesses.

SYDNEY MARQUIS.

Witnesses: i

G. F. DE WEIN,

LIEBER. 

